Further insight into the involvement of PII1 in starch granule initiation in Arabidopsis leaf chloroplasts - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue New Phytologist Année : 2023

Further insight into the involvement of PII1 in starch granule initiation in Arabidopsis leaf chloroplasts

Résumé

The control of starch granule initiation in plant leaves is a complex process that requires active enzymes like Starch Synthase 4 and 3 (SS4 or SS3) and several noncatalytic proteins such as Protein Involved in starch Initiation 1 (PII1). In Arabidopsis leaves, SS4 is the main enzyme that control starch granule initiation, but in its absence, SS3 partly fulfills this function. How these proteins collectively act to control the initiation of starch granules remains elusive. PII1 and SS4 physically interact, and PII1 is required for SS4 to be fully active. However, Arabidopsis mutants lacking SS4 or PII1 still accumulate starch granules. Combining pii1 KO mutation with either ss3 or ss4 KO mutations provide new insights of how the remaining starch granules are synthesized. The ss3 pii1 line still accumulates starch, while the phenotype of ss4 pii1 is stronger than that of ss4. Our results indicate first that SS4 initiates starch granule synthesis in the absence of PII1 albeit being limited to one large lenticular granule per plastid. Second, that if in the absence of SS4, SS3 is able to initiate starch granules with low efficiency, this ability is further reduced with the additional absence of PII1.
Fichier principal
Vignette du fichier
Vandromme et al. New Phytol (2023).pdf (3.84 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-04122207 , version 1 (10-10-2023)

Identifiants

Citer

Camille Vandromme, Corentin Spriet, Jean‐luc Putaux, David Dauvillée, Adeline Courseaux, et al.. Further insight into the involvement of PII1 in starch granule initiation in Arabidopsis leaf chloroplasts. New Phytologist, 2023, 239 (1), pp.132-145. ⟨10.1111/nph.18923⟩. ⟨hal-04122207⟩
41 Consultations
9 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More